CN101710296A - Watchdog circuit - Google Patents
Watchdog circuit Download PDFInfo
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- CN101710296A CN101710296A CN200910194241A CN200910194241A CN101710296A CN 101710296 A CN101710296 A CN 101710296A CN 200910194241 A CN200910194241 A CN 200910194241A CN 200910194241 A CN200910194241 A CN 200910194241A CN 101710296 A CN101710296 A CN 101710296A
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- 238000004891 communication Methods 0.000 description 1
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Abstract
The invention discloses a watchdog circuit, which comprises a watchdog chip (U6). A dog feed output end (WDO) of the watchdog chip is fed back to a manual resetting end (MR), a voltage monitoring output end (PFO) is fed back to a voltage monitoring input end (PFI), a control circuit (100) is arranged between a CPU and the watchdog chip (U6) and comprises a dog feed signal interval control module (110), the input end of the control circuit is connected with an I/O port of the CPU, and the output end of the control circuit is connected with the voltage monitoring input end (PFI) of the watchdog chip (U6); when CPU dog feed signals exceed a preset timing interval, the dog feed signal interval control module (110) outputs a control pulse, and the control pulse is led to the manual resetting end (MR) of the watchdog chip (U6) so that the watchdog chip (U6) performs resetting operation. Because the time interval of the dog feed signals can be adjusted, the watchdog circuit can be flexibly configured.
Description
Technical field
The present invention relates to electronic device field, relate in particular to that a kind of (Central ProcessingUnit CPU) carries out house dog (Watchdog) circuit of monitoring and reset to central processing unit.
Background technology
Usually can use house dog in fields such as computing machine, communication, robotization, effect is to guarantee that electronic equipment CPU program can automatically reset recovery normally when crashing.Its basic functional principle is that after the CPU program crashed, CPU can not carry out regular zero clearing (be commonly called as and feed dog) to watchdog circuit, will reset to electronic equipment above watchdog circuit behind the certain hour.
As shown in Figure 1, watchdog circuit uses special-purpose watchdog chip, as SP706, mainly comprise hand-reset (Manual Reset, MR), feed the dog input (Watchdog Input, WDI), feed dog output (WatchdogOnput, WDO) and the output that resets (Reset, RST).This chip internal timer time cycle is 1.6S, and its I/O pin by CPU is fed dog, when detecting less than feeding-dog signal in 1.6S, will send reset signal, makes electronic equipment reset.
The shortcoming of above-mentioned watchdog circuit is that the time cycle of the timer of watchdog chip is fixed, and must guarantee that feeding-dog signal is less than this time cycle.That is to say that the priority of feeding dog must be very high, otherwise CPU will be taken and stop to feed dog by other task, thereby cause that system is improper restarts.
But real-life various electronic equipment varies, and it is longer that some occasions require to feed dog times, and it is shorter that other occasions require to feed dog times, and general watchdog chip was fixed and can not be satisfied these requirements because of its cycle time.
Summary of the invention
The object of the invention is, a kind of watchdog circuit that can flexible configuration is provided, and can adjust feeding the dog time interval of watchdog circuit.
For solving above technical matters, technical scheme provided by the invention is: a kind of watchdog circuit, comprise watchdog chip (U6), it is fed dog output terminal (WDO) and feeds back to hand-reset end (MR), voltage monitoring output terminal (PFO) feeds back to voltage monitoring input end (PFI), between CPU and described watchdog chip (U6), control circuit (100) is set, comprise feeding-dog signal control module (110) at interval, input end connects the I/O port of CPU, and output terminal connects the voltage monitoring input end (PFI) of described watchdog chip (U6); When the CPU feeding-dog signal exceeded default timing interval, described feeding-dog signal is control module (110) output control pulse at interval, and causes the hand-reset end (MR) of described watchdog chip (U6), makes described watchdog chip (U6) homing action.
Described feeding-dog signal control module (110) at interval comprising:
Counter (U5), reset terminal (RST) connects the I/O port of CPU, produces count pulse by internal oscillator and outside Resistor-Capacitor Unit;
Differentiating circuit (111), input end connect the count pulse output terminal or the count pulse frequency division/frequency multiplication output terminal of described counter (U5), and output terminal connects the voltage monitoring input end (PFI) of described watchdog chip (U6).
Wherein, described counter (U5) is 74HC4060.
Described differentiating circuit (111) comprising:
Triode (N1), base stage connect the count pulse output terminal or the count pulse frequency division/frequency multiplication output terminal of described counter (U5), and emitter-base bandgap grading connects isopotential point, and collector connects power supply;
Electric capacity (C32), an end connects the collector of described triode (N1), and the other end connects the voltage monitoring input end (PFI) of described watchdog chip (U6);
Resistance (R33), an end connect the voltage monitoring input end (PFI) of described watchdog chip (U6), and the other end connects power supply.
Described resistance (R33) also is connected to diode (D4).
Simultaneously, described control circuit (100) comprises feeding-dog signal pulse-width controlled module (120), and input end connects the I/O port of CPU, and output terminal connects hello the dog input end (WDI) of described watchdog chip (U6); When CPU feeding-dog signal pulsewidth surpassed the time cycle of described watchdog chip (U6), the output terminal of described feeding-dog signal pulse-width controlled module (120) kept low level, makes described watchdog chip (U6) homing action.
Described feeding-dog signal pulse-width controlled module (120) comprises counter (U5), produces count pulse by internal oscillator and outside Resistor-Capacitor Unit; The reset terminal (RST) of described counter (U5) connects the I/O port of CPU, and what count pulse output terminal or count pulse frequency division/frequency multiplication output terminal connected described watchdog chip (U6) feeds dog input end (WDI).
Wherein, described counter (U5) is 74HC4060.
In addition, the hand-reset end (MR) of described watchdog chip (U6) is connected to backward dioded (D2).
Preferably, described watchdog chip (U6) is SP706.
Compared with prior art, watchdog circuit of the present invention is provided with feeding-dog signal control module at interval, and the cycle that can guarantee to feed dog in the promptly excessive or too small time interval, all can be triggered the output that resets of watchdog chip in predetermined " window value ".Especially, also be provided with feeding-dog signal pulse-width controlled module, when the feeding-dog signal pulsewidth exceeds the time cycle of watchdog chip, can make the watchdog chip output that resets.
The present invention adopts the array mode of 74HC4060 counter and SP706 watchdog chip, can adjust watchdog circuit flexibly, can adjust feeding the dog time interval of watchdog circuit, and the feeding-dog signal pulsewidth is carried out effective monitoring.This circuit has electrification reset, voltage monitoring and manual reset function concurrently, and it is simple in structure, and response speed is fast, has application promise in clinical practice.
Description of drawings
Fig. 1 is the composition diagram of existing watchdog circuit;
Fig. 2 is the composition diagram of watchdog circuit of the present invention;
Fig. 3 is the waveform synoptic diagram of CPU feeding-dog signal among Fig. 2;
Fig. 4 is the realization circuit diagram of this watchdog circuit;
Embodiment
Basic design of the present invention is that control circuit feeding-dog signal control module at interval is set between CPU and watchdog chip.
Below in conjunction with drawings and Examples watchdog circuit of the present invention is further described.
Referring to Fig. 2, watchdog circuit comprises watchdog chip U6, is preferably SP706, and it is fed dog output terminal WDO and feeds back to hand-reset end MR, and voltage monitoring output terminal PFO feeds back to voltage monitoring input end PFI; Simultaneously, between CPU and watchdog chip U6, control circuit 100 is set, comprises:
Feeding-dog signal is control module 110 at interval, and input end connects the I/O port of CPU, and output terminal connects the voltage monitoring input end PFI of watchdog chip U6; When the CPU feeding-dog signal exceeded default timing interval, feeding-dog signal is control module 110 output control pulses at interval, and cause the hand-reset end MR of watchdog chip U6, make watchdog chip U6 homing action.
Feeding-dog signal pulse-width controlled module 120, input end connects the I/O port of CPU, and output terminal connects hello the dog input end WDI of watchdog chip U6; When CPU feeding-dog signal pulsewidth surpassed the time cycle of watchdog chip U6, the output terminal of feeding-dog signal pulse-width controlled module 120 kept low level, makes watchdog chip U6 homing action.
Wherein, described feeding-dog signal at interval control module 110 comprise:
Counter U5 is preferably 74HC4060, and its reset terminal RST connects the I/O port of CPU, produces count pulse by internal oscillator and outside Resistor-Capacitor Unit;
Described feeding-dog signal pulse-width controlled module 120, single using or sharing counter U5 produces count pulse by internal oscillator and outside Resistor-Capacitor Unit; Its reset terminal RST connects the I/O port of CPU, and what count pulse output terminal or count pulse frequency division/frequency multiplication output terminal connected watchdog chip U6 feeds dog input end WDI.
Referring to Fig. 3, the CPU feeding-dog signal is a square wave, and its pulsewidth (high level) is Th, CPU feeding-dog signal pulse (low level) be spaced apart Tl, it must meet some requirements, and watchdog chip is failure to actuate.Further specify below in conjunction with a specific implementation circuit.
Referring to Fig. 4, this watchdog circuit comprises control circuit 100 and watchdog chip and peripheral circuit 200, and concrete structure is as follows:
14 binary counter U5 reset terminal RST pass through the I/O port that resistance R 25 connects CPU, connect power supply VCC by resistance R 6 simultaneously; Pin VCC connects power supply, pin VSS ground connection, and between power supply input anode and ground and meet filter capacitor C31, C50; The circuit that count pulse is made up of counter U5 internal oscillator and external resistor and capacitor component (being R5, the C73 of connection count pulse pin COUT and the R32 that is connected pin CIN end) produces, and be its oscillation period:
Tosc＝2.2*R5*C73＝6.6ms。
The count pulse (square wave) that oscillator produces can directly be drawn by count pulse pin COUT, also can be exported with the square-wave signal that Q12～Q14 obtains different frequency division/Clock Multiplier Factors by 10 output terminal Q4～Q10 of counter U5, the cycle of each square-wave signal is as shown in table 1 below.
Table 1 counter output square-wave cycle
In watchdog chip and the peripheral circuit 200, the hand-reset end MR of watchdog chip U6 is connected to backward dioded D2, meets power supply VCC by resistance R 7 simultaneously; Voltage monitoring output terminal PFO feeds back to voltage monitoring input end PFI by resistance R 45, and it also introduces hand-reset end MR by resistance R 28; Reset output terminal RST is connected with power supply by resistance R 8, succeeds electrical equipment J4 by resistance R 43 simultaneously, and this relay meets power supply VCC by resistance R 39; Feed dog input end WDI and meet counter output Q4, also can connect the I/O port of CPU, be connected with power supply by resistance R 9 simultaneously by resistance R 27 by resistance R 26; In addition, between power input and ground and meet filter capacitor C33, C60, with the clutter of filtering power supply.
Below describe as shown in table 2 to the main leg signal of watchdog chip U6.
The leg signal title and the function of table 2 watchdog chip
| Title | Function |
| CPU_WDI | Feed the dog input, press Fig. 3 condition entry. |
| MANU_RST | The manual reset input, low level is effective. |
| LNRST | Reset signal output, low level is effective.When VCC is lower than the low level signal input of reset threshold values or MR pin, the low pulse of this pin output 200ms will be triggered. |
| Counter _ WDI | According to the CPU feeding-dog signal, the feeding-dog signal that counter is exported. |
The course of work of above-mentioned watchdog circuit is as follows:
If counter U5 resetting pin RST can not get the feeding-dog signal that CPU sends over by CPU_WDI---positive pulse at the appointed time, then the output terminal Q14 of counter will produce the square-wave signal of a complete cycle in 54.06S, and low level is preceding, high level after; After the differentiating circuit shaping of this square-wave signal high level through triode N1, resistance R 33, capacitor C 32 compositions, form pulse signal Qout; Pass through the voltage monitoring input pin PFI secondary reshaping of watchdog chip U6 again, form the square wave control wave of the about 10ms of pulsewidth; This gating pulse is introduced the manual reset pin MR of watchdog chip U6, makes watchdog chip U6 action at last, output reset enable signal cpu reset.
In addition, because causing watchdog chip U6, counter U5 output terminal Q4 feeds dog input end WDI.If resetting pin hold reset state---the high level of counter U5, promptly the output terminal Q4 of counter U5 keeps the low level time to surpass the time cycle 1.6S of watchdog chip U6 timer, and then watchdog chip U6 exports a reset enable signal cpu reset.
By above analysis as can be known, CPU feeding-dog signal shown in Figure 3 must meet the following conditions, and watchdog circuit just can not move:
High level signal: Th＜1.6S;
Low level signal: 53ms＜Tl＜54S.
Above-mentioned watchdog circuit adopts the array mode of counter and watchdog chip, can adjust feeding the dog time interval of watchdog circuit, also can carry out effective monitoring to the feeding-dog signal pulsewidth, have electrification reset, voltage monitoring and manual reset function concurrently, it is simple in structure, response speed is fast, has application promise in clinical practice.
Only be preferred implementation of the present invention below, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim institute restricted portion.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. watchdog circuit, comprise watchdog chip (U6), it is fed dog output terminal (WDO) and feeds back to hand-reset end (MR), voltage monitoring output terminal (PFO) feeds back to voltage monitoring input end (PFI), it is characterized in that, between CPU and described watchdog chip (U6), control circuit (100) is set, comprise feeding-dog signal control module (110) at interval, input end connects the I/O port of CPU, and output terminal connects the voltage monitoring input end (PFI) of described watchdog chip (U6); When the CPU feeding-dog signal exceeded default timing interval, described feeding-dog signal is control module (110) output control pulse at interval, and causes the hand-reset end (MR) of described watchdog chip (U6), makes described watchdog chip (U6) homing action.
2. watchdog circuit as claimed in claim 1 is characterized in that, described feeding-dog signal control module (110) at interval comprising:
Counter (U5), reset terminal (RST) connects the I/O port of CPU, produces count pulse by internal oscillator and outside Resistor-Capacitor Unit;
Differentiating circuit (111), input end connect the count pulse output terminal or the count pulse frequency division/frequency multiplication output terminal of described counter (U5), and output terminal connects the voltage monitoring input end (PFI) of described watchdog chip (U6).
3. watchdog circuit as claimed in claim 2 is characterized in that, described counter (U5) is 74HC4060.
4. watchdog circuit as claimed in claim 2 is characterized in that, described differentiating circuit (111) comprising:
Triode (N1), base stage connect the count pulse output terminal or the count pulse frequency division/frequency multiplication output terminal of described counter (U5), and emitter-base bandgap grading connects isopotential point, and collector connects power supply;
Electric capacity (C32), an end connects the collector of described triode (N1), and the other end connects the voltage monitoring input end (PFI) of described watchdog chip (U6);
Resistance (R33), an end connect the voltage monitoring input end (PFI) of described watchdog chip (U6), and the other end connects power supply.
5. watchdog circuit as claimed in claim 4 is characterized in that, described resistance (R33) also is connected to diode (D4).
6. watchdog circuit as claimed in claim 1, it is characterized in that, described control circuit (100) comprises feeding-dog signal pulse-width controlled module (120), and input end connects the I/O port of CPU, and output terminal connects hello the dog input end (WDI) of described watchdog chip (U6); When CPU feeding-dog signal pulsewidth surpassed the time cycle of described watchdog chip (U6), the output terminal of described feeding-dog signal pulse-width controlled module (120) kept low level, makes described watchdog chip (U6) homing action.
7. watchdog circuit as claimed in claim 6 is characterized in that, described feeding-dog signal pulse-width controlled module (120) comprises counter (U5), produces count pulse by internal oscillator and outside Resistor-Capacitor Unit; The reset terminal (RST) of described counter (U5) connects the I/O port of CPU, and what count pulse output terminal or count pulse frequency division/frequency multiplication output terminal connected described watchdog chip (U6) feeds dog input end (WDI).
8. watchdog circuit as claimed in claim 7 is characterized in that, described counter (U5) is 74HC4060.
9. watchdog circuit as claimed in claim 1 is characterized in that, the hand-reset end (MR) of described watchdog chip (U6) is connected to backward dioded (D2).
10. as each described watchdog circuit of claim 1-9, it is characterized in that described watchdog chip (U6) is SP706.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101942413A CN101710296B (en) | 2009-11-27 | 2009-11-27 | Watchdog circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101942413A CN101710296B (en) | 2009-11-27 | 2009-11-27 | Watchdog circuit |
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| CN101710296A true CN101710296A (en) | 2010-05-19 |
| CN101710296B CN101710296B (en) | 2012-05-23 |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567129A (en) * | 2011-12-30 | 2012-07-11 | 深圳市大富科技股份有限公司 | Watchdog starting method and corresponding device |
| CN103488104A (en) * | 2013-10-08 | 2014-01-01 | 国家海洋技术中心 | Monitoring reset system |
| CN103530195A (en) * | 2012-07-05 | 2014-01-22 | 英飞凌科技股份有限公司 | Monitoring circuit with a window watchdog |
| CN104391757A (en) * | 2014-12-19 | 2015-03-04 | 天津七一二通信广播有限公司 | Protecting circuit for preventing continuous damage and implementation method |
| CN104391460A (en) * | 2014-09-04 | 2015-03-04 | 吉林省寰旗卫星导航通信集团有限公司 | Watchdog timer circuit |
| CN106128080A (en) * | 2016-08-30 | 2016-11-16 | 长沙威胜信息技术有限公司 | A kind of novel concentrator |
| CN106209042A (en) * | 2016-08-31 | 2016-12-07 | 广州先尚计算机科技有限公司 | A kind of circuit allowing local circuit reset from fault and method thereof |
| CN106528319A (en) * | 2016-12-02 | 2017-03-22 | 山东有人信息技术有限公司 | Watchdog circuit capable of configuring dog-feeding cycle |
| CN106874149A (en) * | 2017-03-15 | 2017-06-20 | 深圳市亿道数码技术有限公司 | A kind of hardware watchdog logic circuit |
| CN107122032A (en) * | 2016-02-25 | 2017-09-01 | 西安中兴新软件有限责任公司 | Terminal, crash reset control circuit and method |
| CN109582489A (en) * | 2018-12-12 | 2019-04-05 | 陕西航空电气有限责任公司 | A kind of design method based on MAX791 watchdog circuit MBIT self-test |
| CN109921497A (en) * | 2019-04-25 | 2019-06-21 | 广州极飞科技有限公司 | Power supply circuit, weather station, method of supplying power to and house dog based on house dog |
| CN110955552A (en) * | 2019-11-26 | 2020-04-03 | 上海移远通信技术股份有限公司 | Watchdog circuit and circuit module |
| CN112615609A (en) * | 2020-11-16 | 2021-04-06 | 中国电子科技集团公司第五十八研究所 | Reset circuit with automatic watchdog switching period |
| CN113127246A (en) * | 2021-04-01 | 2021-07-16 | 易事特集团(河南)有限公司 | Watchdog circuit, control method and watchdog chip |
-
2009
- 2009-11-27 CN CN2009101942413A patent/CN101710296B/en not_active Expired - Fee Related
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567129A (en) * | 2011-12-30 | 2012-07-11 | 深圳市大富科技股份有限公司 | Watchdog starting method and corresponding device |
| CN103530195A (en) * | 2012-07-05 | 2014-01-22 | 英飞凌科技股份有限公司 | Monitoring circuit with a window watchdog |
| CN103530195B (en) * | 2012-07-05 | 2016-08-10 | 英飞凌科技股份有限公司 | Monitoring circuit with window watchdog |
| CN103488104A (en) * | 2013-10-08 | 2014-01-01 | 国家海洋技术中心 | Monitoring reset system |
| CN103488104B (en) * | 2013-10-08 | 2015-05-06 | 国家海洋技术中心 | Monitoring reset system |
| CN104391460A (en) * | 2014-09-04 | 2015-03-04 | 吉林省寰旗卫星导航通信集团有限公司 | Watchdog timer circuit |
| CN104391757B (en) * | 2014-12-19 | 2017-08-11 | 天津七一二通信广播股份有限公司 | It is a kind of to prevent the protection circuit and implementation method of sustaining damage |
| CN104391757A (en) * | 2014-12-19 | 2015-03-04 | 天津七一二通信广播有限公司 | Protecting circuit for preventing continuous damage and implementation method |
| CN107122032A (en) * | 2016-02-25 | 2017-09-01 | 西安中兴新软件有限责任公司 | Terminal, crash reset control circuit and method |
| CN107122032B (en) * | 2016-02-25 | 2022-03-22 | 西安中兴新软件有限责任公司 | Terminal, and crash reset control circuit and method |
| CN106128080A (en) * | 2016-08-30 | 2016-11-16 | 长沙威胜信息技术有限公司 | A kind of novel concentrator |
| CN106209042A (en) * | 2016-08-31 | 2016-12-07 | 广州先尚计算机科技有限公司 | A kind of circuit allowing local circuit reset from fault and method thereof |
| CN106528319A (en) * | 2016-12-02 | 2017-03-22 | 山东有人信息技术有限公司 | Watchdog circuit capable of configuring dog-feeding cycle |
| CN106528319B (en) * | 2016-12-02 | 2024-01-30 | 山东有人物联网股份有限公司 | Watchdog circuit capable of configuring dog feeding period |
| CN106874149A (en) * | 2017-03-15 | 2017-06-20 | 深圳市亿道数码技术有限公司 | A kind of hardware watchdog logic circuit |
| CN106874149B (en) * | 2017-03-15 | 2023-11-21 | 深圳市亿道数码技术有限公司 | Hardware watchdog logic circuit |
| CN109582489A (en) * | 2018-12-12 | 2019-04-05 | 陕西航空电气有限责任公司 | A kind of design method based on MAX791 watchdog circuit MBIT self-test |
| CN109582489B (en) * | 2018-12-12 | 2022-08-02 | 陕西航空电气有限责任公司 | MAX791 watchdog circuit MBIT self-detection-based design method |
| CN109921497A (en) * | 2019-04-25 | 2019-06-21 | 广州极飞科技有限公司 | Power supply circuit, weather station, method of supplying power to and house dog based on house dog |
| CN110955552B (en) * | 2019-11-26 | 2023-08-22 | 上海移远通信技术股份有限公司 | Watchdog circuit and circuit module |
| CN110955552A (en) * | 2019-11-26 | 2020-04-03 | 上海移远通信技术股份有限公司 | Watchdog circuit and circuit module |
| CN112615609B (en) * | 2020-11-16 | 2022-08-02 | 中国电子科技集团公司第五十八研究所 | Reset circuit with automatic watchdog switching period |
| CN112615609A (en) * | 2020-11-16 | 2021-04-06 | 中国电子科技集团公司第五十八研究所 | Reset circuit with automatic watchdog switching period |
| CN113127246A (en) * | 2021-04-01 | 2021-07-16 | 易事特集团(河南)有限公司 | Watchdog circuit, control method and watchdog chip |
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| CN101710296B (en) | 2012-05-23 |
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